MIC2166_1009 Datasheet, PDF (1/28 Pages) Micrel Semiconductor – Adaptive On-Time DC-DC Controller Hyper Speed Control™ Family

MIC2166
Adaptive On-Time DC-DC Controller
Hyper Speed Control™ Family
General Description
The Micrel MIC2166 is a synchronous adaptive on-time
buck controller targeting high-performance, cost-sensitive
applications such as set-top boxes, gateways, routers,
computing peripherals, and telecom/networking
equipment.
The MIC2166 operates over a supply range of 4.5V to
28V. It has an internal linear regulator which provides a
regulated 5V supply to power the internal control circuitry.
MIC2166 operates at a constant 600kHz switching
frequency and can be used to drive up to 25A of output
current. The output voltage is adjustable from 0.8V to
5.5V.
A unique Hyper Speed Control™ architecture enables
ultra-fast transient response while reducing the output
capacitance and also makes High V_IN/Low V_OUT operation
possible.
A UVLO feature is provided to ensure proper operation
under power-sag conditions to prevent the external power
MOSFET from over heating. Also, a soft-start feature is
provided to reduce the inrush current. Short current
sensing on the bottom MOSFET with hiccup mode current
limiting ensures protection in case of an output short
circuit. Further, the MIC2166 includes an EN pin to shut
down the converter and a Power-Good (PGOOD) pin to
allow simple sequencing.
The MIC2166 is available in a 10 pin MSOP ePad package
with a junction operating temperature ranging from –40°C
to +125°C. All support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Hyper Speed Control™ architecture enables
- High delta V operation (V_IN=28V and V_OUT=0.8V)
- Small output capacitance
• Built-in 5V regulator for single-supply operation
• Any Capacitor^TM stable
- Zero ESR to high ESR
• Power-Good (PGOOD) output
• Input voltage range: 4.5V to 28V
• 5μA typical shutdown current
• 25A output current drive capability
• Adjustable output from 0.8V to 5.5V with ±1% FB
accuracy
• 600kHz switching frequency
• Internal 5ms digital soft-start
• Thermal-shutdown and hiccup current-limit protection
• No external current-sense resistor required
• Safe start-up into pre-biased loads
• 10-pin MSOP ePad package
• –40°C to +125°C junction temperature range
Applications
• Set-top box, gateways, routers and DSL modems
• Printers, scanners, graphic and video cards
• Servers, PCs and processor core supply
• Low-Voltage Distributed Power
Typical Application
MIC2166 Adjustable Output 600kHz Buck Converter
100
90
80
70
60
50
40
30
20
10
0
0
12V to 3.3V Efficiency
1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (A)
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Hyper Light Load and Any Capacitor are trademarks of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
September 2010
M9999-092410-C